Paul il d unger



(No Model.)

P. H.-DUNGER. TELEPHONE.

' N0. 478,692. Patented July 12, 1892.

UNITED STATES PATENT OFFICE.

PAUL II. DUNGER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE DUNGER LONGDISTANCE TELEPHONE COMPANY, OF SAME PLACE.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 478,692, dated July 12,1892.

Application filed March 29, 1892. Serial No. 426,931. (No model.)

To all whom it, may concern:

Be it known that 1, PAUL H. DUNGER, of Chicago, Illinois, have inventedcertain new and useful Improvements in Telephones, whereof the followingis a specification.

The object of my invention is to perfect the transmission of articulatespeech by telephone. A difiiculty met with in telephony has been therunning together of the words sent through the instrument, even when theenunciation of the speaker has been good. This is due to the inertia ofthe diaphragm and to the fact that a strong voice gives it a adapted toact upon the diaphragm and regulate its vibration.

The particular form of the invention which I consider the best is shownin the accompanying drawings, in which Figure l is a central section atright angles to the diaphragm of a transmitting-instrument, and Fig. 2is aback view of same.

In the figures, 1 is the rim orframe, in which is mounted the diaphragm2. 3 are arms secured to the frame 1 by screws 401' otherwise andextending over the diaphragm. 5 are screws tapped through the ends ofarms 3, so as to be adjustable therein. (3 are dampers or butters ofindia-rubber or equivalent material on the ends of screws 5, which maybe pressed more or less hard against the diaphragm or may beadjustedtoward orfrom it.

I claim The combination, substantially as set forth, in a telephone, ofthe diaphragm, an arm projecting over the diaphragm, a screw in saidarm, and a buffer actuated by said screw and adapted to bear against thediaphragm.

PAUL I1. DUNGER.

XVitnesses:

VICTOR S. DUNGER, M. J. CRowE.

